Opaque block



FIG. 1 is a perspective view.

FIG. 2 is a back perspective view.

FIG. 3 is a front view.

FIG. 4 is a left side view.

FIG. 5 is a right side view.

FIG. 6 is a top view.

FIG. 7 is a bottom view; and,

FIG. 8 is a back view. 

CLAIM The ornamental design for an opaque block, as shown and described. 